The galaxy cluster Abell 746 (A746; z=0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed V-shaped X-ray emission, and intricate galaxy distributions, is a unique and complex merging system. We present a weak-lensing analysis of A746 based on wide-field imaging data from Subaru/Hyper Suprime-Cam observations. The mass distribution is characterized by a main peak which coincides with the center of the X-ray emission. At this main peak, we detect two extensions toward the north and west, tracing the cluster galaxy and X-ray distributions. Despite the ongoing merger, our estimate of the A746 global mass M500=4.4±1.0×1014M⊙ is consistent with the previous results from SZ and X-ray observations. We conclude that reconciling the distributions of mass, galaxies, and intracluster medium with the double radio relic system and other radio features remains challenging.
@article{arxiv.2311.00643,
title = {Weak-Lensing Analysis of the Complex Cluster Merger Abell 746 with Subaru/Hyper Suprime-Cam},
author = {Kim HyeongHan and Hyejeon Cho and M. James Jee and David Wittman and Sangjun Cha and Wonki Lee and Kyle Finner and Kamlesh Rajpurohit and Marcus Brüggen and William Forman and Christine Jones and Reinout van Weeren and Andrea Botteon and Lorenzo Lovisari and Andra Stroe and Paola Domínguez-Fernández and Ewan O'Sullivan and Jan Vrtilek},
journal= {arXiv preprint arXiv:2311.00643},
year = {2024}
}